678725 has 12 divisors (see below), whose sum is σ = 891684. Its totient is φ = 510720.

The previous prime is 678721. The next prime is 678731. The reversal of 678725 is 527876.

678725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 16129 + 662596 = 127^2 + 814^2 .

It is not a de Polignac number, because 678725 - 2² = 678721 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 374 + ... + 1223.

It is an arithmetic number, because the mean of its divisors is an integer number (74307).

2⁶⁷⁸⁷²⁵ is an apocalyptic number.

It is an amenable number.

678725 is a deficient number, since it is larger than the sum of its proper divisors (212959).

678725 is a wasteful number, since it uses less digits than its factorization.

678725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624 (or 1619 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 678725 is about 823.8476800963. The cubic root of 678725 is about 87.8815986862.

The spelling of 678725 in words is "six hundred seventy-eight thousand, seven hundred twenty-five".